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Skin testing is typically done for the most common allergens. Many allergens, however, are less common or even unknown. If you tested negative to all 45 allergens, then you likely have either a sensitivity to a less common allergen or you have nonallergic rhinitis, which just seems like an allergy.
At any rate, you certainly can get on with treatment. A combination of nasal sprays, antihistamines and eye drops (if needed) should help. If not, there are other options that don't require knowledge of what specifically you are allergic to. Ask your allergist for advice.